Table 2 The list of operations in the segmentation and feature computation stages and the sources of the CPU and GPU versions

Class

Operations

Computed Features

CPU and GPU Implementation

Pixel Statistics

Histogram Calculation

Mean, Median, Min, Max, 25 %, 50 %, and 75 % quartile

Implemented

Gradient Statistics

Gradient and Histogram Calculation

Mean, Median, Min, Max, 25 %, 50 %, and 75 % quartile

Implemented

Haralick

Normalization pixel values and Co-occurrence matrix

Inertia, Energy, Entropy, Homogeneity, Max prob, Cluster shade, Prominence

Implemented

Edge

Canny and Sobel

Canny area, Sobel area

OpenCV (Canny), Implemented (Sobel)

Morphometry

Pixel counting, Dist. among points, Area and Perimeter, Fitting ellipse, Bounding box, Convex hull, Connected components, Area, Perimeter, Equivalent diameter, Compactness, Major/Minor axis length, Orientation, Eccentricity, Aspect ratio, Convex area, Euler number